Heya, answering from my phone so excuse any typos. I would go for a Pi 3 b+. I am not sure if the sdk works with pi 4 yet. Also check out the mutable instruments breadboard friends. There are a few places that sell them in kit form. Very handy.

For the time being we support only the RPi 3B / B+, the RPi 4 will be supported early next year, sooner is unlikely.

You do not strictly need to be comfortable with electronics to use the board, you can make a user interface for your system by remote-controlling our Sushi headless-DAW over Open Sound Control and/or gRPC. The UI could be on a touch-screen tablet, or PC/Mac, for example made using Lemur, TouchOSC, or Open Stage Control.

There’s a tweak you’ll need to make to the sd card to allow the keyboard USB to work.

Per another post:

You’ll have to edit the file /boot/cmdline.txt and remove the part that says dwc_otg.speed=1. This will break some MIDI USB devices, it is an issue on the RPi 3 single-board computer which only has an OTG USB controller.